问题
解答题
用简便方法计算(写出计算过程):
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答案
(1)385+295+105
=385+(295+105)
=385+400
=785;
(2)643-12-88
=643-(12+88)
=643-100
=543;
(3)125×32
=125×8×4
=1000×4
=4000;
(4)8×48×125
=8×125×48
=1000×48
=48000;
(5)4200÷6÷7
=4200÷(6×7)
=4200÷42
=100;
(6)360÷45
=360÷9÷5
=40÷5
=8;
(7)125×8+275×8
=(125+275)×8
=400×8
=3200;
(8)99×84
=1100×84-1×84
=8400-84
=8316;
(9)25×1-25
=25-25
=0.